为满足美国中央情报局和联邦政府机构以及政府代理商的特殊需求，由美国政府指定DSG研究室与美国中央情报局以及其他联邦机关立约承包制造，以配合这些机关在执行不寻常任务时偶尔使用。即使这些产品现已不再是政府机关的专用品，但普通市民绝不得不经慎重考虑而任意使用。这种试剂只有在某种特定情况下使用，现对非政府机构开放! 

Purple Rain
Purple Rain starts out as an innocent-looking dark green powder, but when it comes in contact with any moisture, watch out! This stuff keeps coming out with a seemingly endless supply of dark purple stain. Imagine a sprinkle of it in a strategic spot in the bathroom, the doormat where people wipe their wet shoes, the swimming pool area, the drinking fountain, etc. Caution: this will stain most anything - use only with extreme caution and discretion.